TV Display Procedures                       pro/tv             January 1995

The procedures in this directory involve the use of the (usually X windows)
image display.

BLINK - Blink two windows in an X-windows display
CURS - Change the shape of the X windows cursor
CURVAL - Interactive display of image intensities and astronomical coordinates
PIXCOLOR - Set specified pixel values to a specified color
SIGRANGE() - Find range of pixel values which contain 90% of the image values
TVBOX - Draw a box of specified size on the image display
TVCIRCLE - Draw a circle of specified radius on the image display
TVELLIPSE - Draw an ellipse of specified axes on the image display
TVLASER - Write an image to postscript file with annotation from a FITS header
TVLIST - Display intensity values surrounding the cursor position

Notes:

TVLIST requires the use of the non-standard system variable !TEXTOUT.
This can be added to one's session using the astronomy library procedure
ASTROLIB.

To display astronomical coordinates with CURVAL, one must have a FITS header
with astrometry information.   The astrometry can be either the CRPIX, CDELT
CROTA keywords used by AIPS, IRAS etc. or the CRPIX,CD keywords used in
Space Telescope data.   Several procedures from the ASTROM directory are used.

Users probably want to tailor TVLASER to choose their preferred FITS
keywords for supplying annotation

Bill Thompson has written an additional set of image display routines that
are not part of the standard IDL astronomy library but which are available
in the contrib/thompson/image_display directory.    See the README file in
that directory for more info.
